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| 4/7/2023 | Marshalltown Speedway - Marshalltown, IA IMCA FrostBuster Night 2 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 7th | - | 4th | 19th |
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| 4/13/2023 | Marshalltown Speedway - Marshalltown, IA King of the High Banks $5,000.00 to Win IMCA Stock Cars Qualifying Night IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Hobby Stock) | 5th | - | - | 7th |
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| 4/14/2023 | Marshalltown Speedway - Marshalltown, IA King of the High Banks $5,000.00 to Win IMCA Stock Cars Iowa Air Barrier Championship Dirt Pro Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 5th | - | - | 8th |
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| 4/28/2023 | Marshalltown Speedway - Marshalltown, IA Ryan Ashton 2023 IMCA Weekly Racing Championship Season Opener Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Hobby Stock) | 1st | - | - | 7th |
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| 5/6/2023 | Boone Speedway - Boone, IA Saturday Night Series Weekly #4 Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 8th | - | 7th | - |
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| 5/11/2023 | Marshalltown Speedway - Marshalltown, IA Muffler Pros Cliff Chambers Memorial Thursday Night Thunder plus Outlaw Cruisers Sportsmans, Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Rain Out |
| 5/13/2023 | Boone Speedway - Boone, IA Saturday Night Series Weekly #5 Dirt Mini Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Hobby Stock) | 8th | - | - | DNS |
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| 6/9/2023 | Marshalltown Speedway - Marshalltown, IA P&D Welding Solutions $1,000.00 to Win Modifieds Plus $500.00 to Win Modified Structural Shoot-Out Dwarf, Dirt Pro Trucks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Northern SportMod) | 8th | - | - | 19th |
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| 6/16/2023 | Marshalltown Speedway - Marshalltown, IA Midwest Liquid Systems $1,000.00 to Win IMCA Modifieds After The Creek Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Northern SportMod) | 8th | - | - | 12th |
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| 6/17/2023 | Boone Speedway - Boone, IA Saturday Night Series Weekly #10 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Rain Out |
| 6/23/2023 | Marshalltown Speedway - Marshalltown, IA RBF Electric Night $500.00 to Win IMCA Hobby Stocks IMCA Weekly Racing Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Northern SportMod) | 6th | - | - | 12th |
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| 6/30/2023 | Marshalltown Speedway - Marshalltown, IA Minute Man Printing Night IMCA Weekly Racing Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | William Klosterman (IMCA Northern SportMod) | 7th | - | - | 20th |
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| 7/8/2023 | Boone Speedway - Boone, IA Saturday Night Series Weekly #13 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Northern SportMod) | 8th | - | 5th | - |
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| 7/14/2023 | Marshalltown Speedway - Marshalltown, IA Rumours Bar & Grill plus Salute to Our Marshall County Law Enforcement, First Responder's and EMT's Stock Cars, Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Northern SportMod) | 9th (DNF) | - | - | DNS |
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| 7/15/2023 | Boone Speedway - Boone, IA Saturday Night Series Weekly #14 IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Northern SportMod) | 3rd | - | - | 16th |
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| 7/21/2023 | Marshalltown Speedway - Marshalltown, IA Vessco Inc. $2,000.00 To Win IMCA Stock Cars Highbanks After the Creek Dirt Crown / Outlaw Mini Mods Stock Cars: Dirt Crown Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, Sportsman Dwarf | Results | | William Klosterman (IMCA Northern SportMod) | 8th | - | - | 17th |
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| 7/22/2023 | Boone Speedway - Boone, IA Saturday Night Series Weekly #15 + King of the Katwalks for Stock Cars IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Northern SportMod) | 3rd | - | - | 15th |
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| 8/12/2023 | Boone Speedway - Boone, IA P1P Challenge - Watermelon Classic A Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Mod Lite | Results | | William Klosterman (IMCA Northern SportMod) | 8th | - | 10th (DNF) | - |
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| 10/21/2023 | Maquoketa Speedway - Maquoketa, IA Iowa Dirt Nationals - Bob Larson & Terry Huizel Memorial Sportsmans, 600cc Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | William Klosterman (IMCA Northern SportMod) | 4th | - | 6th | - |
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